CSS3 ::响应式网页设计
响应式网页设计提供了最佳体验，易于阅读和易于导航，并且在不同设备（例如台式机，手机和标签页）上的调整最小。
响应结构
下图显示了网页的响应结构。
灵活的网格演示
100% Wide Container
Section
75% Wide Container
Section
50% Wide Container
Section
媒体查询
媒体查询针对的是不同尺寸的设备（例如手机，台式机等）的不同样式规则。
If screen size is less than 420px, then it will show lightblue
color, or else it will show light pink color
Bootstrap响应式网页设计
Bootstrap是最流行的基于HTML，CSS和Java脚本的Web设计框架，它可以帮助您以响应方式为所有设备设计网页
Tutorials point
nhooo.comoriginated from the idea that there exists a class
of readers who respond better to online content and prefer to learn
new skills at their own pace from the comforts of their drawing rooms.
Android
Android is an open source and Linux-based operating system for mobile
devices such as smartphones and tablet computers. Android was developed
by the Open Handset Alliance, led by Google, and other companies.
CSS
Cascading Style Sheets, fondly referred to as CSS, is a simple design
language intended to simplify the process of making web pages presentable.
Java
Java is a high-level programming language originally developed by Sun
Microsystems and released in 1995. Java runs on a variety of platforms,
such as Windows, Mac OS, and the various versions of UNIX. This tutorial
gives a complete understanding of Java.